Which organism is the cause of botulism?

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Botulism is caused by a neurotoxin produced by Clostridium botulinum. This organism is an anaerobic, spore-forming gram-positive rod that is commonly found in soil and can contaminate improperly canned foods. In low-oxygen environments, its spores can germinate and release botulinum toxin, which blocks acetylcholine release at neuromuscular junctions, producing flaccid paralysis and potential respiratory failure. The other organisms listed cause foodborne illness through different toxins or infections—Staphylococcus aureus produces enterotoxins that cause rapid vomiting and diarrhea, Bacillus cereus can cause vomiting or diarrhea, and Escherichia coli can cause various GI symptoms but not botulism. Thus, the organism responsible for botulism is Clostridium botulinum.